package com.bwie.filter;

import io.jsonwebtoken.Claims;
import io.jsonwebtoken.Jwts;
import jdk.nashorn.internal.ir.annotations.Ignore;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.cloud.gateway.filter.GatewayFilterChain;
import org.springframework.cloud.gateway.filter.GlobalFilter;
import org.springframework.context.annotation.Configuration;
import org.springframework.core.annotation.Order;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.http.HttpStatus;
import org.springframework.http.server.reactive.ServerHttpRequest;
import org.springframework.http.server.reactive.ServerHttpResponse;
import org.springframework.web.server.ServerWebExchange;
import reactor.core.publisher.Mono;

import java.util.concurrent.TimeUnit;

/**
 * description:
 *
 * @Author chentong
 * @Create 2025/4/23 14:13
 * @Version 1.0
 */
@Configuration
@Order(1)
public class MyGlobalFilter implements GlobalFilter {

    @Autowired
    StringRedisTemplate redisTemplate;

    @Override
    public Mono<Void> filter(ServerWebExchange exchange, GatewayFilterChain chain) {
        /*获取请求参数*/
        ServerHttpRequest request = exchange.getRequest();
        ServerHttpResponse response = exchange.getResponse();
        String url = request.getURI().getPath();
        System.out.println("请求路径" + url);

        /*白名单*/
        if(url.contains("/adminLogin")){
            System.out.println("登录接口白名单：" + url);
            return chain.filter(exchange);
        }
        if (url.contains("/userReg")){
            System.out.println("注册接口白名单：" + url);
            return chain.filter(exchange);
        }

        /*检查并验证token*/
        //获取请求头中的token
        String token = request.getHeaders().getFirst("token");
        if (token == null || token.isEmpty()){
            //token为空，进行拦截，并返回401状态
            System.out.println("token为空" + url);
            response.setStatusCode(HttpStatus.UNAUTHORIZED);
            return response.setComplete();
        }
        //解析token
        Claims claims = Jwts.parser().setSigningKey("123456").parseClaimsJws(token).getBody();
        //获取id
        Integer userId = claims.get("id", Integer.class);
        String redisKey = "token-" + userId;
        //获取redisToken
        String redisToken = redisTemplate.opsForValue().get(redisKey);
        //如果token为空
        if (redisToken == null || redisToken.isEmpty()){
            System.out.println("token已过期" + url);
            response.setStatusCode(HttpStatus.UNAUTHORIZED);
            return response.setComplete();
        }
        //如果token不为空  比较两个token
        if (!token.equals(redisToken)){
            System.out.println("token错误" + url);
            response.setStatusCode(HttpStatus.UNAUTHORIZED);
            return response.setComplete();
        }

        /*token续期  （续期60分钟）*/
        redisTemplate.expire(redisKey,60, TimeUnit.MINUTES);

        /*放行(转发)*/
        System.out.println("放行" + url);

        return chain.filter(exchange);
    }
}
